FLLXT971A Intel, FLLXT971A Datasheet - Page 50

• Manufacturer Part Number: FLLXT971A
• Description: 3.3V Dual Speed Fast Ethernet PHY Transceicer
• Manufacturer: Intel

www.DataSheet4U.com
DataSheet U .com
4
LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
50
Figure 23. Typical Twisted-Pair Interface - NIC
1. Center-tap current may be supplied from 3.3 V VCCA as shown. Additional power savings may
2. The 100 Ω transmit load termination resistor typically required is integrated in the LXT971A.
3. Magnetics without a receive pair center-tap do not require a 2 kV termination.
4. RJ-45 connections shown for standard NIC. TX/RX crossover may be required for repeater and
be realized by supplying the center-tap from a 2.5 V current source. A separate ferrite bead
(rated at 50 mA) should be used to supply center-tap current.
switch applications.
LXT971A
TPFON
TPFOP
TPFIP
SD/TP
TPFIN
VCCA
GND
0.1µF
270 pF 5%
270 pF 5%
0.1µF
2
50Ω 1%
50Ω 1%
0.01 µF
.01µF
1
1:1
1:1
3
*
*
50 Ω
50 Ω
* = 0.001 µF / 2.0 kV
Rev. Date: August 7, 2002
50 Ω
50 Ω
50 Ω
50 Ω
Document #: 249414
Revision #: 002
Datasheet
RJ-45
4
8
7
6
5
4
3
2
1